Manythingsthatpeopleuseeachdaystartedwithasimple（简单的）idea.Thesethingshaveoften__31___thewaywe31live.Somehelpustodoajobmore___32__.Othershelpustofillaneedor___33___aproblem. 　　In1858Lipmanhadsuchan33idea.Onedayhetook34___apencil,apieceofpaper,andaneraser.34Thenhebegantowrite.Sometimeshe__35___tochangea35word.Eachtimehehadto____36____underhisbooksandpapersto36findtheeraser.“Iwishmyeraserwouldstayinone____37____!”hethoughttohimself. 　　ThenLipmanhadhissimpleidea.Hecuta___38___inoneendofthe38pencil.Heglued（粘）theeraserintothisgroove（沟槽）.Laterhethoughtthat39othersmight___39__tohavesuchapencil.Sohesoldhisdesign(设计).Soonpencils40___eraserscameintouse.Somepencilswitheraserswere40_____.Hisdesignhelpedhimmakelotsofmoney,hegot$100,000. 　　31.A.shownB.foundC.changedD.pointed 　　32.A.easilyB.clearlyC.luckilyD.carefully 　　33.A.discussB.studyC.offerD.solve 　　34.A.backB.outC.awayD.off 　　35.A.beganB.failedC.refusedD.needed 　　36.A.searchB.seeC.hideD.move 　　37.A.sideB.boxC.placeD.space 　　38.A.holeB.grooveC.markD.crossing 　　39.A.agreeB.forgetC.likeD.mean 　　40.A.withB.withoutC.orD.and